AP5101 Datasheet PDF - Diodes Incorporated

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AP5101
Diodes Incorporated

Part Number AP5101
Description 1.5A Step-Down Converter
Page 15 Pages


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AP5101www.DataSheet4U.com
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
Description
Pin Assignments
The AP5101 is a current mode step-down converter with a
built-in power MOSFET to enable smallest solution size
power conversion.
With the low series resistance power switch it enables a
constant output current of up to 1.5A over a wide input supply
range. The load and line regulation has excellent response
time over the operating input voltage and temperature range.
The AP5101 is self protected, through a cycle-by-cycle
current limiting algorithm and an on chip thermal protection.
The AP5101 will provide the voltage conversion with a low
count of widely available standard external components.
The AP5101 is available in SO-8 package.
( Top View )
SW 1
8 GND
IN 2
7 BST
EN 3
6 COMP
GND 4
SO-8
5 FB
Features
Applications
• VIN 4.75 to 22V
• 1.5A Peak Output Current
• Stable with Low ESR Ceramic Output Capacitors
• External compensation
• Up to 92% Efficiency
• 0.1µA Shutdown Mode
• Fixed 1.4MHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Output Adjustable from 0.81V to 15V
• SO-8: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
• Distributed Power Systems
• Battery Charger
• Pre-Regulator for Linear Regulators
• WLED Driver
Note: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
Input
4.75V to 22V
C4
C1
OFF
ON
3 EN
2
IN
7
BST
1
SW
AP5101
5
FB
GND
COMP
4,8 6
C3
R3
L1
R1
D1
R2
Output
3.3V 1.5A
C2
AP5101
Document number: DS32258 Rev. 1 - 2
Figure 1 Typical Application Circuit
1 of 15
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AP5101www.DataSheet4U.com
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
Typical Application Circuit (continiued)
Input
4.75V to 22V
C1
10uF/25V
CERAMIC
C4
10nF
R4
100k
2
3 IN
EN
7
BST SW 1
AP5101
GND
FB 5
COMP
4,8 6
C3
3nF
R3
5.6k
D1
B340A
L1
4.7uH
R1
49.9k 1%
R2
16.2k 1%
Output
3.3V
1.5A
C2
22µF/6.3V
CERAMIC
X2
Figure 2. 1.4MHz, 3.3V Output at 1.5A Step-Down Converter
AP5101
Document number: DS32258 Rev. 1 - 2
2 of 15
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July 2010
© Diodes Incorporated



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AP5101www.DataSheet4U.com
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
Pin Descriptions
( Top View )
SW 1
8 GND
IN 2
7 BST
EN 3
6 COMP
GND 4
SO-8
5 FB
Pin Name
SW
IN
EN
GND
FB
COMP
BST
GND
Pin Number
Descriptions
1 Switch Output. This is the reference for the floating top gate driver.
Supply Voltage. The AP5101 operates from a +4.75V to +22V unregulated
2 input. A decoupling capacitor C1 is required to prevent large voltage spikes
from appearing at the input. Place this capacitor near the IC.
On/Off Control Input. Do not leave this pin floating. To turn the device ON, pull
3 EN above 1.2V and to turn it off pull below 0.4V.
If enable/disable is not used, connect a 100kresistor between EN to VIN.
Ground. This pin is the voltage reference for the regulated output voltage. For
4
this reason care must be taken in its layout. This node should be placed
outside of the D1 to C1 ground path to prevent switching current spikes from
inducing voltage noise into the part.
Feedback. To set the output voltage, connect this pin to the output resistor
5
divider or directly to VOUT. To prevent current limit run away during a current
limit condition, the frequency foldback comparator lowers the oscillator
frequency when the FB voltage is below 400mV.
6
Compensation. COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND.
Bootstrap. To form a boost circuit, a capacitor is connected between SW and
7
BST pins to form a floating supply across the power switch driver. This
capacitor is needed to drive the power switch’s gate above the supply voltage.
Typical values for CBST range from 0.1uF to 1uF.
Ground. This pin is the voltage reference for the regulated output voltage. All
8 control circuits are referenced to this pin. For this reason care must be taken in
its layout.
AP5101
Document number: DS32258 Rev. 1 - 2
3 of 15
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AP5101www.DataSheet4U.com
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
Absolute Maximum Ratings (Note 2)
Symbol
Parameter
VIN Supply Voltage
VSW Switch Voltage
VBS Boost Voltage
All Other Pins
TST Storage Temperature
TJ Junction Temperature
TL Lead Temperature
ESD Susceptibility
HBM
Human Body Model
MM Machine Model
Note: 2. Exceeding these ratings may damage the device.
Thermal Resistance (Note 3)
Rating
26
–0.3 to VIN + 0.3
VSW + 6
–0.3 to +6
-65 to +150
+150
+260
2
200
Unit
V
V
V
V
°C
°C
°C
kV
V
Symbol
Parameter
θJA Junction to Ambient
θJC Junction to Case
Note: 3. Test condition for SO-8: Measured on approximately 1” square of 1 oz copper.
Rating
120
15
Unit
°C/W
°C/W
Recommended Operating Conditions (Note 4)
Symbol
Parameter
Min
Note:
VIN Supply Voltage
4.75
TA Operating Ambient Temperature Range
-40
VOUT
Output Voltage
0.81
4. The device function is not guaranteed outside of the recommended operating conditions.
Max
22
+85
15
Unit
V
°C
V
AP5101
Document number: DS32258 Rev. 1 - 2
4 of 15
www.diodes.com
July 2010
© Diodes Incorporated



AP5101 datasheet pdf
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AP5101 pdf
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